JPS637730B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pull-down mechanism in a pruning machine that sequentially pruns branches of a tree trunk using a chainsaw.

Conventionally, various types of pruning machines have been proposed, but in all of them, the pruning machine moves up the tree trunk in a spiral shape with driving wheels, and on the way,
Branches are pruned using a chainsaw, and after the pruning is completed, they are lowered in a spiral shape by the reverse drive of the driving wheels or by the weight of the pruning machine.

Therefore, it takes time to lower the pruning machine, and the pruning time for one tree is long, resulting in poor work efficiency.

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional art, and when the pruning process is completed, the pruning machine is lowered straight from the tree trunk by operating the advance/retreat operation device, thereby shortening the descending time. The purpose of this paper is to propose a pull-down mechanism for a pruning machine that can improve the efficiency of pruning work.

Next, the present invention will be explained with reference to the drawings which are one embodiment.

The pruning machine A consists of a main machine frame 2 and an auxiliary machine frame 3 that is integrated with the main machine frame 2 by a spring 5, and a chain saw 1 is provided on the top of the main machine frame 2 to protrude upward. As shown in FIG. 1, the tree trunk 2 is provided with a total of four mutually parallel drive running wheels 4, two at the top and two at the top and two at the top and bottom, so as to be diagonal to the vertical direction of the tree trunk 12.

In addition, there are a total of 6 pieces, 3 each on the upper and lower parts of the auxiliary machine frame 3, which is integrated with the main machine frame 2 and holds the tree trunk 12.
A driven wheel 16 is provided, which is made up of two (two in total, four in total) free wheels.

The main engine frame 2 and the auxiliary engine frame 3 are the main engine frame 2 and the auxiliary engine frame 3.
A guide rod 17 provided on the main engine frame 2 and an auxiliary engine frame 3 are inserted into a guide ring 18 provided on the auxiliary machine frame 3, and the spring 5 is tensioned between the main engine frame 2 and the auxiliary machine frame 3 to integrate them, and is attached to the tree trunk 12. It is.

By the way, the driven wheel 16 is provided with a fork 14 rotatable around the horizontal axis 13 facing the center of the tree trunk 12 which is held between the machine frames 2 and 3 by the force of the spring 5. Horizontal axis 1
The fork 14 is made to protrude in a direction crossing the direction 3, and a rubber ring 15 is pivotally supported on this fork 14.

In addition, 19 is a driving device for the running wheels 4, 20 is a prime mover using a gasoline engine operated by a timer of the same device 19, and 21 is a take-up reel for the hanging string 9.

Further, a lever 7 is attached to the main engine frame 2 by means of a pin 6.
is pivotally supported, and a rolling wheel 8 is attached to the lower end of this lever 7, which rolls up and down with respect to the tree trunk 12.
Attached to the upper end is a string 9 of a reel 21, which is attached and detached when the timer is turned off, or detached from the ground with a rod or the like and dropped. still,
The lever 7 is always biased by a spring 10 so as to hold the wheel 8 at the position indicated by the solid line (that is, the position away from the tree trunk 12), and the lever 7 and the reel 21 constitute a forward/backward operating device 11.

Next, the operation of the pruning machine A having the above configuration will be explained.

The main engine frame 2 and the auxiliary engine frame 3 are arranged on both sides of the tree trunk 12, the guide rod 17 is inserted into the guide ring 18, and the spring 5 is stretched between both engine frames 2 and 3, so that the tree trunk 12 can be connected to the drive running wheel. 4 and the driven wheel 16. In this case, lever 7
is in the state shown in Figure 2.

Here, when the prime mover 20 is started, the drive running wheels 4 are in pressure contact with the tree trunk 12 due to the force of the spring 5, so the rotation of the driving wheels 4 causes the pruning machine A to
The chain saw 1, which is driven by In this case, since the driven wheels 16 are free wheels, they follow the running direction of the running wheels 4.

In this way, when the pruning machine A ascends the tree trunk 12 for a predetermined period of time, the timer turns off and the prime mover 20 stops, and at the same time, the reel 21 is attached to and detached from the main machine frame 2 by a device (not shown), or is attached to the main machine frame 2 by a rod or the like. Remove it from the ground and drop it to the ground. and reel 2
When the string 9 of No. 1 is pulled and the lever 7 is rotated to the position of the imaginary line in FIG. distance from.

In other words, the pruning machine A is supported by the tree trunk 12 by the rolling wheels 8 and the driven wheels 16. Also,
Since the rolling wheels 8 roll in the vertical direction relative to the tree trunk 12, and the driven wheels 16 are free wheels, the pruning machine A moves straight down the tree trunk 12 due to its own weight. When the string 9 is loosened, the spring 10 returns the rolling wheels 8 to their original state, and the pruning machine A comes to a halt with the driven wheels 16 and the driving running wheels 4, so the pruning machine A is lowered to the ground. To make it, string 9
It is preferable to lower it step by step by pulling it several times.

In addition, even if the chain saw 1 comes into contact with a branch during pruning work and pruning becomes impossible, the lever 7 can be temporarily rotated with a rod or the like and pulled down a predetermined distance.
It may be raised again.

As is clear from the above explanation, according to the present invention, when the pruning machine descends from the tree trunk, the advancing/retreating device presses the rolling wheels that roll vertically against the tree trunk, and as a result, the tree trunk The driving wheel, which is diagonal to the vertical direction of the pruning machine, is separated from the tree trunk, and the tree trunk is supported by the rolling wheels and the driven wheels, so the pruning machine descends straight under its own weight without turning as in conventional pruning machines.
Therefore, the descending time is short, and the pruning work can be performed more efficiently.

Moreover, since the running wheels are composed of a driving running wheel and a driven wheel consisting of a free wheel, the swing and rise of the pruning machine are
Since the driven wheels closely follow the turning and rising of the drive running wheels and no unreasonable force is applied to the driven wheels, there is also the effect that the prime mover can be made inexpensive, lightweight, and compact.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a pruning machine equipped with the pulling mechanism of the present invention, Fig. 2 is a side view of Fig. 1 seen from the left, and Fig. 3 is a plan view of the wheel in the forward state. be. A...Pruning machine, 1...Chain saw, 2...Main machine frame, 3...Auxiliary machine frame, 4...Mutual parallel drive running wheels, 5...Spring, 8...Rolling wheels, 11...Advance/backward operation Device, 16...driven wheel, 7... lever.

Claims (1)

[Claims] 1 Consists of a main machine frame 2 having a chainsaw 1 and an auxiliary machine frame 3 facing the main machine frame 2, four mutually parallel drive running wheels 4 are provided on the main machine frame 2, and the running wheels 4 are arranged obliquely with respect to the vertical direction of the tree trunk 12. In a pruning machine A in which the auxiliary machine frame 3 is provided with a plurality of driven wheels, and both machine frames 2 and 3 are connected by a spring 5, the driven wheel is a free wheel 16, while the main machine frame 2 A forward/retreat operating device 11 consisting of a lever 7 having a vertically movable rolling wheel 8 at its tip is pivotally supported on the tree trunk 12, and by vertically operating the lever 7, the rolling wheel 8 is rotated.
A pull-down mechanism for a pruning machine, characterized in that it can move forward and backward toward the auxiliary machine frame 3.